If it's PM between 2 regular/unknown users which released for historical purpose, it's good enough. But since it's PM between Satoshi and other user who could be targeted, there are few ways to identify the other user, such as
1. Date/Time of the PM.
2. Writing style.
3. Typo which rarely occurred (such as "covfefe").
I don't think any of those would necessarily identify a user. At least not with any amount of certainty. Also, the reason why someone might be targeted is not that they were talking with satoshi, it would be because someone might be able to infer how much coin they have, and the redactions I proposed should remove that risk.
Fair point, but i stand by my point unless more redaction is applied and it's released far in the future (after average of life expectancy after genesis block is mined).